Light dependent and Light independent reactions

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Presentation transcript:

Light dependent and Light independent reactions Photosynthesis Light dependent and Light independent reactions

Energy Photosynthesis takes kinetic energy (light) and converts it to potential energy (stored in chemical bonds) Adenosine diphosphate (ADP) is converted to adenosine triphosphate (ATP)

Overall This is the reaction, but it happens in steps in the chloroplast. 1. Light-dependent reactions 2. Calvin Cycle (light independent reactions)

Energy pairing

Leaves to Chloroplasts

Leaves to Chloroplasts Leaf adaptations Cuticle– Waxy layer to prevent water loss Stomata – pore for gas exchange Mesophyll cells – layers of cells with many chloroplasts Vascular bundles – veins for water and mineral flow (xylem and phloem)

Leaves to Chloroplasts Double outer membrane Stroma – semifluid space Thylakoids – membranous sacs with photosystems made of pigments Granum – stack of thylakoids

Capturing light Pigments absorb some light waves while reflecting others Chlorophyll is a pigment found in the thylakoids

Photosynthesis Steps Light-dependent Reaction Where? Thylakoids Reactants? Water Products? Oxygen Energy source? Light Energy carriers? Turns ADP to ATP and NADP+ to NADPH Calvin Cycle (light-independent) Where? Stroma Reactants? CO2 and H2O Products? Glucose Energy source? ATP and NADPH Energy Carriers? Turns ATP to ADP and NADPH to NADP+

Photosynthesis reaction analysis Textbook reference: Light dependent 210-211 Light independent 212-213 Video introduction: https://www.youtube.com/watch ?v=mYbMPwmwx88&noredirect= 1